Ubiquiti has announced the new UniFi Access Door Hub Mini this week, which is not only a lot cheaper than the original Access Hub, but also it seems fit for purpose for most single door deployments. The unit is very small, at 113mm x 66mm x 27.6mm and has three ethernet ports, one for power in at PoE++ and two PoE outputs, used for powering two door access readers, or one door reader and one UniFi Protect camera. It also has a few relays for sensors, buttons and locks.
The new UniFi Access Door Hub Mini is listed on the official Ubiquiti store for £102 in the UK and is marked as "coming soon". In the US, it is available now for $129.